nederland 193 netherlands 192 onderzoek 98 research 98 colleges (hoorcolleges) 94 lectures 94 modellen 89 models 89 hydrologie 73 hydrology 73 agriculture 72 landbouw 68 openbare redes 65 public speeches 65 cum laude 61 plant breeding 61 plantenveredeling 61 plant pests 60 plantenplagen 60 bodem 57 soil 57 groei 56 growth 56 simulatie 56 simulation 56 bosbouw 55 forestry 55 simulatiemodellen 53 simulation models 53 plant diseases 52